Worksheet: Centering in Cubic Lattices
In this worksheet, we will practice describing the atomic coordinates, packing densities, and hole geometries in cubic lattices.
The compound contains a metal ion with an ionic radius 49% smaller than that of the anion . Determine which of the following statements is false, given that the metal ions have the following coordinates:
- AThe metal ions are hexacoordinate.
- BThe lattice has a body-centered structure.
- CThe lattice adopts the cubic structure with the highest packing efficiency.
- DThere are four ions within the unit cell.
Cesium and sodium are group 1 metals, but the coordination number of cesium in the unit cell is 8, whereas the coordination number of sodium in the unit cell is 6. What allows cesium to have a larger coordination number?
- AChlorine is too electronegative to be completely compatible with sodium.
- BThe radius ratio is greater than that of , forcing anions farther from the metal cation.
- CSodium has a larger ionic radius than cesium, allowing for less anion attraction.
- DDue to its size, cesium makes more contact with adjacent anions than sodium does.